[Rd] R string comparisons may vary with platform (plain text)

[Stuart Ambler]

You mean where it says that some platforms may not respect the locale (I
assume, though don’t know, that en_US.UTF-8 and en_US.utf8 would be the
same)?  But I gather that the general problem has been looked into and is
difficult to solve; thanks.

On 11/22/14, 12:42 PM, "Duncan Murdoch" <murdoch.duncan at gmail.com> wrote:

>On 22/11/2014, 2:59 PM, Stuart Ambler wrote:
>> A colleague¹s R program behaved differently when I ran it, and we
>>thought
>> we traced it probably to different results from string comparisons as
>> below, with different R versions.  However the platforms also differed.
>> A
>> friend ran it on a few machines and found that the comparison behavior
>> didn¹t correlate with R version, but rather with platform.
>> 
>> I wonder if you¹ve seen this.  If it¹s not some setting I¹m unaware of,
>> maybe someone should look into it.  Sorry I haven¹t taken the time to
>>read
>> the source code myself.
>
>Looks like a collation order issue.  See ?Comparison.
>
>Duncan Murdoch
>
>> Thanks,
>> Stuart
>> 
>> R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"
>> Platform: x86_64-unknown-linux-gnu (64-bit)
>> Sys.getlocale()
>> [1] 
>> 
>>"LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.U
>>TF
>> 
>>-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;L
>>C_
>> 
>>NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFI
>>CA
>> TION=C"
>> 
>> "-1" > "1"
>> [1] TRUE
>> 
>> "-1" <"1"
>> [1] FALSE
>> 
>> "1" < "-1"
>> [1] TRUE
>> 
>> "1" < "-"
>> [1] FALSE
>> 
>> Vs.
>> 
>> R version 3.1.1 (2014-07-10) ‹ ³Sock it to Me"
>> Platform: x86_64-redhat-linux-gnu (64-bit)
>> Sys.getlocale()
>> [1] 
>> 
>>"LC_CTYPE=en_US.utf8;LC_NUMERIC=C;LC_TIME=en_US.utf8;LC_COLLATE=en_US.utf
>>8
>> 
>>;LC_MONETARY=en_US.utf8;LC_MESSAGES=en_US.utf8;LC_PAPER=en_US.utf8;LC_NAM
>>E
>> 
>>=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.utf8;LC_IDENTIFICATIO
>>N
>> =C"
>> 
>> "-1" > "1"
>> [1] FALSE
>> 
>> "-1" <"1"
>> [1] TRUE
>> 
>> "1" < "-1"
>> [1] FALSE
>> 
>> "1" < "-"
>> [1] FALSE
>> 
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>